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In a distant region of space thought to be empty, a newly discovered dwarf planet inspires a debate about the existence of a giant planet hiding out there.
Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.
U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.
Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...
The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge of our solar system.
Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the existence of a theoretical Planet Nine.
A dwarf planet called 50000 Quaoar that orbits beyond Neptune appears to have a ring that shouldn't be there, at 7.4 times more distant than the planet's radius.
Astronomers have discovered a freezing-cold world orbiting within the so-called "forbidden zone" around a dying star in which planets are normally destroyed. The 5.8-billion-year-old white dwarf ...
Astronomers think that a dwarf planet hiding in the middle of our solar system could be a source of frozen water. The dwarf planet Ceres is located in the asteroid belt between Mars and Jupiter. A ...
Astronomers in Japan have published their theory of an "Earth-like planet," dubbed Planet Nine, that's hiding in plain sight just a few billion miles behind Neptune.
Return to Ceres: This dwarf planet could contain the clues to life’s origins Hunting for the building blocks of life? Located in the asteroid belt, Ceres is likely a good bet, study finds ...
The dwarf planet Makemake, which chills out in the deep freeze of the outer Solar System, might be home to an ice volcano 1. Makemake is one of many icy worlds that orbit the Sun past Neptune.